Contour lines

- Join areas of equal height with a line


external image image108.gif

Spot heights

- Spot heights are points measured to be exactly the height above sea level.

external image contours-spot.jpg

Shading

-Shading, colours represents contours in the land
-Generally, dark an light shading/colours are used to differentiate the countours

external image Portugal_Shading_Relief_Map_1982.jpg